There are commercial "line monitors" that monitor the "goodness" of incoming AC power. They are available for rent from most test equipment rental places. The devices document the nature and time of powerline "events". Such a line monitor might help you isolate the cause of your circuit's...
The compressed air from the supercharger will be warmer than the intake air due to adiabatic heating ("heat of compression"). An intercooler (aftercooler) will cool the compressed air and make it denser. The denser air allows more fuel to be added thus more horsepower can be generated...
